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The 2021 book by Davi Vieira offers a deep dive into specific advanced topics that elevate this architecture from a theory to a practical tool.

Ports & Adapters architecture on example - Wojciech Krzywiec hexagonal-architecture |____pom

public class UserRepositoryAdapter implements UserRepository @Override public User findByUsername(String username) // Implement data access logic using Hibernate or other ORM

@PostMapping("/accounts/id/withdraw") public void handle(@PathVariable Long id, @RequestBody MoneyDto dto) withdrawUseCase.withdraw(id, dto.toMoney()); However, there are official ways to access the

Demystifying Hexagonal Architecture in Java: Clean Code, Ports, and Adapters

package com.example.order.domain; import java.math.BigDecimal; import java.util.UUID; public class Order private final UUID id; private final String product; private final BigDecimal price; private String status; public Order(UUID id, String product, BigDecimal price, String status) this.id = id; this.product = product; this.price = price; this.status = status; public void validate() if (price.compareTo(BigDecimal.ZERO) <= 0) throw new IllegalArgumentException("Price must be greater than zero"); // Getters and core domain logic methods public UUID getId() return id; public String getProduct() return product; public BigDecimal getPrice() return price; public String getStatus() return status; Use code with caution. Step 2: Create the Ports (Interfaces) private String password

Do not import Spring, Hibernate, or Jackson annotations into your domain models or use cases.

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public class User private String username; private String password;